Heads up lovely readers, this is a long quote (well, technically it’s two quotes), but I have a good reason for picking it, I promise.
The Doctor: Yes, because there are laws. There are laws of time. And once upon a time there were people in charge of those rules. But they died. They all died. So you know who that leaves? Me! It’s taken me all these years to realize, the laws of time are mine! And they will obey me!
The Doctor: Nah! … Different details but the story’s the same.
Brooke: But you can’t know that! And if my family changes the whole of history could change. The future of the human race. No one should have that much power.
The Doctor: Tough.
Brooke: You should have left us there.
The Doctor: Adelaide I’ve done this sort of thing before. In small ways, saved some little people. But never someone as important as you. Oh, I’m good.
Brooke: Little people?! What, like Mia and Yuri? Who decides they’re so unimportant? You?
The Doctor: For a long time I thought I was just a survivor, but I’m not. I’m the winner. That’s who I am. The Time Lord Victorious.
Brooke: And there’s no one to stop you.
The Doctor: No.
Brooke: This is wrong, Doctor. I don’t care who you are. The Time Lord Victorious is wrong.
The Doctor: That’s for me to decide. Now you better get home. Aw! It’s all locked up. You’ve been away. Still, that’s easy. All yours.
Brooke: Is there nothing you can’t do?
The Doctor: Not anymore.
— Tenth Doctor, The Waters of Mars
Remember how I said last week that it wasn’t good for the Doctor to travel alone for too long? Well, this is one of the reasons why. This is one of the times he got carried away. Like Donna said in her first adventure with the Doctor, “I think sometimes you need someone to stop you.” But after Donna left, he travelled alone for too long and he didn’t have someone with him to stop him when he really needed it. Because as Brooke stated – “Time Lord Victorious is wrong.” And in some ways this episode, with the Doctor behaving in this way, made it easier to say goodbye to this Doctor, something that happened just a few short episodes later.
I mean, it was still really sad to say goodbye to Ten, because he was such an amazing Doctor. But after this episode, it was clear that he needed to regenerate. He needed something of a fresh start. Because he had gone too far. Because “Time Lord Victorious” is contrary to what it means to be “The Doctor.” And “Time Lord Victorious” has lost site of his belief that everyone is important.